Oracle creates an entry for each Oracle RAC database in the
oratab configuration file. The
oratab file is created by the
root.sh script during installation, and it is updated by the Database Configuration Assistant when creating or deleting a database.
oratab file entry is also created automatically by the Database Agent when a database is first started on a node where it has not run previously. Oracle ASM Agent creates Oracle ASM
Oracle Enterprise Manager uses the
oratab file during service discovery to determine the name of the Oracle RAC database, and to determine if the database must be started automatically when the system is restarted.
The database entry has the following syntax:
A colon (:) is used as the field terminator. A new line terminates the entry. Lines beginning with a pound sign (#) are comments. Because all the instances of an Oracle RAC database have the same
DB_UNIQUE_NAME, but each instance has its own
ORACLE_SID, use the
$DB_UNIQUE_NAME environment variable in the
oratab file as the database entry.
$DB_UNIQUE_NAME identifier for your Oracle RAC database must be unique across your enterprise.
$ORACLE_HOME is the directory path to the database, and
N indicates that the database should not be started at restart time. The following is an example entry for a database named